Filter



Aug. 4, 1953 LQH. HovE ET AL FILTER Filed Sept. 23, 1948 J 2 Sheets-Sheet Aug. 4, 1953 Y L. H. HovE ET AL FILTER Filed sept. 23, 1948 Patented Aug. 4, 1953 FILTER Leland H. Hove, Elmer J. Hankes, and Manly- M. Perry, Minneapolis, Minn., assignors to Hove Spark-O-Liner Corporation, Min-l neapolis, Minn., a corporation of Minnesota Application September 23, 1948, Serial No. 50,774

This invention relates to a new and improved filter and more particularly to a lter especially adapted for ltering the water in the cooling system of a motor vehicle.

It is well known that the cooling systems of motor vehicles often become clogged to such an extent as to seriously reduce the cooling eiect. The cooling passages are quite small and are easily clogged by scale, sand, rust or other material carried by the water from the engine block to the radiator. Water introduced into the system may contain foreign matter either in suspension or in solution. Material in solution may deposit on the walls of the system and, in addition to reducing eiective passage areas for the Water, may also have a serious insulating effect.

It has been found that it is not normally practical or desirable to insert a lter in the direct line of flow between the engine block and radiator, as the iiow resistance through the filter may adversely affect the cooling action. The filter of the present invention'is designed to be located adjacent the engine and cooling system and to have a portion of the cooling system water passed through the filter by the normal cooling circulation. It will be understood that where reference is made herein to water, it is intended to include any fluid used in such a system. Such fluids may include Various known anti-freeze chemicals, rust inhibitors or other materials so used.

It is an object of the present invention to pro vide a new and improved filter for fluids,

It is a further object to provide such a lilter for use in connection with the cooling systems of motor vehicles.

It is an additional object to provide a fluid lter with a removable lter cartridge comprising filtering material in a ilexible fabric casing.

It is also an object to provide a filter of this character in which means are provided to prevent passage of fluid through the lter other than through the filter agent.

It is another object to provide a lter for use with cooling systems in which agents for dissolving or loosening scale or the like may be incorporated with the lter agent.

It is a further object to provide a filter having a visible sump for removed impurities and meansl fordraining the sump. l

It is an additional object to provide a mpeg 1 claim. (C1. 21o-140) 2 which is simple in design and operation and adapted for commercial production and use.

Other and further objects will appear as the description proceeds. l

We have shown certain preferred embodiments of our invention in the accompanying drawings, in which- Figure 1 is an elevation of the apparatus as seen from the front;

Figure 2 is an elevation of the apparatus as seen from the right of Figure 1;

Figure 3 is a vertical cross section of the apparatus taken on line A3--3 of Figure 1; and

Figure 4 is a fragmentary horizontal section broken away to show the construction.

In the drawings, the yiilter comprises the housing or body member II which is provided with the rigid attaching brackets I2 and I3. The lower lug I5 carries a resilient bracket I1, this resilient bracket being provided in order to take up some of the shocks transmitted to the lter by the vibration of the motor vehicle. It will be vunderstood that these brackets I2, I3 and I'I will ordinarily be secured to the fire wall of an automobile or truck, the filter` normallybeing located in the engine compartment, The cover I9 is secured to the top of the body member I I by means yof bolts 20. As shown in Figure 4,` these bolts 20 fit in tangentially inclined slots 22 formed in lugs 23which`lugs are integral with the cover. The, cover may thus be removed by loosening the bolts and'rotating the cover until the bolts clear the'slots and lugs.

As shown in Figure 3, a gasket 25 is secured in a groove in the cover and bears on the upper edge of the body II. The cover has an upwardly eX- tending portion 21 i-nto` which is threaded the coupling member 28 by means of which a hose or 40. other tube issecured to carry off the ltered fluid from the upper portion of the lter. p

The lower portion of the lter body, as shown in Figure 3, is provided with a plurality of internal lugs 30 which support a perforated plate 32. This plate'then may carry, as shown in Figure 3, a ne mesh filter sheet 33 formed of fabric or other foraminous material. The filtering medium itself comprises nely divided material such as sand, shown at'35, enclosed ina fabric cover- Iing' 36,- this-covering being ofsuch a mesh as to permit passage of water while preventing such nely divided material from passing out.

The upper perforated plate 38 rests on the top of the nlter bag and is held down by the compression spring 39, the upper portion of which is seated upon an inner extension 40 of the cover I9.

The bottom of the body member Il has a depressed portion ft2 into which is threaded the connector 43 which is similar to the upper connector 28. The outer face of the bottom of the member il: has a threaded lug 45- into which iS screwed a boltA 4G, the. head 48 of this bolt being located below the sump bott-om member 49. The lateral wall of the sump, as shown, comprises a tubular glass member 5I which is clamped against the bottom of the body Il by means of the member 49 and bolt 48. Suitable gaskets are provided in order to have fluid-tight joints at both ends of member 5l. An opening 53, indicated in broken lines in Figure 4, leads from the inside of the bottom of the housing ll into the sump casing 5 l. Trapped material may be drawn out from the sump by unscrewing the plug 55 which closes a sloping passage leading to the bottom of the sump around the bolt llt.

The exact manner in which the lter is connected into the cooling system of a motor vehicle may be varied to suit different conditions and requirements.l A portion only of the fluid in the system is bypassed through the lter and the lter is not in the direct pump circuit which carries the entire cooling water ow. Preferably, the intake connection 43 is connected by a suitable hose or other iiexible tube to a low point in the system and the upper connection 28 is connected to a high point. in the system. The iiow in the filter is upwardly into connection 43 and out through connection 28., The larger particles of material in the Water, such as scale or sand., are trapped in the lower portion of the body ll below the perforated plate 32 and nlter sheet 33. The, ner material is trapped in the iilter body containing the nely divided material. Substantially clear uid passes out through the top of the lter body and through the perforated plate 38. The pressure of the spring 39 aids in maintaining the fabric covering of the Iilter body in firm contact with the walls of the housing so as. to prevent channeling of any water and its contained impurities up between the easing and filter body.

The preferred material for use in the fabric covering 38 is, a clean iine grade of lter sand. This sand should be coarse eno-ugh in relation to the nature of the fabric casing 3e so that none ofit will be carried from the iilter into the water in the cooling system.

In order to increase the efficiency ofthe sand in filtering minute impurities, the sand may have mixed with it a icl-forming material such as aluminum hydroxide. In addition, the sand may have mixed' with it any of the well known types of chemicals used for cleaning out cooling systems by loosening scale and other impurities. One such material comprisesl sodium carbonate. The materials used should be of the type which may remain in the system without harm to the metals or hose in the system. They may be placed in as a layer at thev top of the filter body so that they will be dissolved and carried into the cooling system promptly after each new lter bag is installed in the filter. On the other hand, with certain types of chemicals and installations, it may be. desirable tol have the Chemicals mixed through the sand so that they will become dissolved and pass into the system more gradually during the use of the filter.

It will be understood that the lter bags will be periodically replaced when they lose their efficiency. The number of hours of service or miles of travel at which they should be removed will be largely dependent upon the character of the water used and the c-cndition of the cooling system surfaces when the filter is placed in use. When first placed in the cooling system of a vehicle which has had considerable use, the filter may be clogged rather rapidly and need replacement. On the other hand, when the filter has been in the system of the vehicle for some time and the system has been well cleaned out, a filter bag may last for a very considerable length of time before it requires replacement. The condition oi" the liquid and the amount of deposited solids in the glass sump casing 5I are visible to the person servicing the vehicle, and the plug 55 may be withdrawn whenever the car is serviced and substantial quantities of impurities are present for removal.

Another feature of the filter is its use to minimise the normal electrolytic action in a cooling system. In such systems, the water passages in the engine are ordinarily formedof ferrous metal while the heat exchange portion of the system is commonly formed of sheets of brass having a high copper content. These two metals are connected by the cooling liquid which acts as an electrolyte. The current formed is small, but has been found to have a definite adverse eicct on the metals. This can be minimized by inserting certain other metals such as aluminum or magnesium, or alloys of such metals, in the system. For this reason, the iilter is designed to present substantial surfaces of such metals to the liquid. This can be accomplished by making the housing Il or the upper and lower plates 32 and 3B or any combination of them of these metals.

While we have shown and described certain preferred embodiments of our invention, these are to be understood to be illustrative only as it is capable of variation to meet differing conditions and requirements, and we contemplate such modifications as come within the spirit and scope of `the appended claim.

We claim:

A filter construction for use in the cooling systems of internal combustion engines comprising a housing, a removable cover therefor, the housing having a chamber therein, lugs extending inwardly from a lower portion of the inner face of the walls of the chamber, a perforated plate seated on said lugs forming an inlet chamber in the lower portion of the housing, an inlet passage leading into the central portion of said chamber, a closed porous fabric casing containing nely divided filtering media fitting upon the perforated plate, a second perforated plate tting in the housing chamber upon the fabric casing, a compression spring engaging the second plate and the underface of the cover to compress the fabric casing and contents between the plates, the cover having an outlet passage therein leading from the central upper portion of the chamber, a bolt extending downwardly from the bottom of the l'iousing, a circular sump bottom member supported on the bolt, a transparent tubular sump wall held by the bottom member against the bottom of the housing, the housing bottom having an opening therein communicating with the sump, the bottom member having a. discharge passage therein 2nd a removable closure in the passage.

LELAND H. HOVE. ELMER J. HANKES. MANLY M. PERRY.

References Cited in the le of this patent UNITED STATES PATENTS Number 4 2,087,136

6 Name Date Andrus July 13, 1937 Baucom et al. Oct. 12, 1937 Nooney Sept. 13, 1938 Wilkinson et al Dec. 19, 1939 Krieck May 14, 1940 Rogers June 3, 1941 Wilkinson Mar. 31, 1942 Ralston Apr. 7, 1942 Hothersall Oct; 20, 1942 Bentley Mar. 7, 1944 Pratt Dec, 19, 1944 Hubert Mar. 13, 1945 Butler July 15, 1947 Frankenhoff Apr. 26, 1949 

